There may very well be artificial supply with respect to medallions, except there's one major indefensible problem with that position - I don't know any cab drivers living the high life. Do you?
I'm pretty sure the cab drivers themselves do not own the medallions.
Not every driver in SF owns a medallion. Drivers who are owners can and do rent out the medallions to other drivers for when the owner is not himself out driving. In this way, medallions can theoretically be utilized 100% of the time. The way it works in SF is that most drivers are affiliated with a fleet (they are not employees of the fleet). The fleets typically (though not always) own the vehicles. The fleets rent the medallions and then hand them out along with the vehicles to the drivers, and the fleets also handle insurance and other infrastructure stuff, plus dispatch. The drivers pay a "gate fee" at the start of their shift to the fleet, and then keep their earnings that they make during the shift (so they start out in the hole and earn out their gate fee (hopefully!) and then anything on top of that is profit to them).
It may be completely different in other cities. My understanding is that in NYC, drivers are typically not medallion owners, and there aren't really fleets in the SF sense -- instead there are taxi yards that offer some of the same functions, but have a less exclusive relationship with taxis and some kind of different business model. But I don't know much about NYC. In cities with less expensive medallions, I'm sure it works differently again.
Source: I am an employee of Flywheel -- we work closely with SF cabs.
EDIT: By the way, again in SF at least, where medallions recently cost $250k (they've gone down since), you might ask "How does a cab driver pay $250k"? The answer was simple: they get loans. There are or were bank loans available to get a medallion, on the basis that medallions gave you the earning power necessary to pay back the loans. So, given that banks are not charitable organizations, if you're wondering who got the excess value created by the legal monopoly of the medallion, part of the answer is "banks."
The cab driver have to pay the medallion holders.
That position is quite easy to defend if you understand the industry. The reason that you don't know any cab drivers living the high life is in fact because of medallions. Medallion owners don't need to drive taxis. If you control the medallion, you're made. No pun intended.
As recently as July 2014, medallions in NYC were being sold privately for over a million dollars (http://www.nyc.gov/html/tlc/downloads/pdf/july_2014_medallio...).
Some interesting economics on the industry and how we got where we are: http://blog.priceonomics.com/post/47636506327/the-tyranny-of...
From the moment you get into any Uber product (e.g. uberX, UberBLACK) to the moment you’re dropped off, your ride is covered by commercial liability insurance
> pass annual maintenance checks
Not just any car can be an Uber. It’s a title reserved for safe, high-quality vehicles that are in exceptional condition. In the U.S., the average model year for vehicles on our platform is 2008, and none are from before 2004+.
> Or you've got 50,000 gas guzzlers on the road
Uberpool: http://blog.uber.com/uberpool
> Or they get into fights with customers. Or there is some other worse criminal activity.
Uber/Lyft are far better in this respect since there is a record of both the driver and passenger (and a log of their GPS coordinates).
Also: Every ridesharing and livery driver is thoroughly screened through a rigorous process we’ve developed using industry-leading standards. This includes a three-step criminal background screening for the U.S. — with county, federal and multi-state checks that go back as far as the law allows — and ongoing reviews of drivers’ motor vehicle records throughout their time on Uber.
> Not just any car can be an Uber. It’s a title reserved for safe, high-quality vehicles that are in exceptional condition. In the U.S., the average model year for vehicles on our platform is 2008, and none are from before 2004+.
That does not answer "pass annual maintenance checks". This literally says that it has 10 year old cars on the road that don't have to pass annual maintenance checks. Ouch.
Lyft does too: https://www.lyft.com/safety
I don't understand your definition of "fair." You say "for better or worse," but I would only consider it unfair if government regulations are for better, which I highly doubt.